[PR] [core] Make FormatReaderFactory return FileRecordReader to reduce cast [paimon]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi opened a new pull request, #4512:
URL: https://github.com/apache/paimon/pull/4512

   <!-- Please specify the module before the PR name: [core] ... or [flink] ... -->
   
   ### Purpose
   
   <!-- Linking this pull request to the issue -->
   In `ApplyBitmapIndexRecordReader` and `ApplyBitmapIndexRecordReader`, they will check the type of iterator which should be `FileRecordIterator`, it is always `FileRecordIterator`, and we should garrantee it by interface.
   
   So we let FormatReaderFactory return FileRecordReader, and all related readers should be `FileRecordReader`s.
   
   <!-- What is the purpose of the change -->
   
   ### Tests
   
   <!-- List UT and IT cases to verify this change -->
   
   ### API and Format
   
   <!-- Does this change affect API or storage format -->
   
   ### Documentation
   
   <!-- Does this change introduce a new feature -->
   


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Re: [PR] [core] Make FormatReaderFactory return FileRecordReader to reduce cast [paimon]

["yuzelin (via GitHub)" <gi...@apache.org>]

yuzelin merged PR #4512:
URL: https://github.com/apache/paimon/pull/4512


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